Adding start codes directly into Marlin

Hello,
The title is pretty self-explanatory.
I would like to add a start code into marlin so that it's universal and doesn't need to be added in the slicer.
The reason for this is that I'm not the only one using the printer and some people may not have the correct start code in their slicer.
Do you have an idea how would I have to go about doing this?
Thank you.

take a look at #define STARTUP_COMMANDS "M17 Z"
In Configuration_adv.h

depends how long you want it....

just separate gcodes with \n

but putting heat up commands here is no a good idea

Edited 1 time(s). Last edit at 12/22/2020 07:58AM by Dust.

Thank you very much, but is there something like the startup but executing at the start of a print?

I know that Prusaslicer 2.3.0 rc1 has different Printer and Filament G-Codes shown below maybe this will help.

Printer G-Codes
Start G-Code
End G-Code
Before Layer change G-Code
After Layer change G-Code
Tool change G-Code
Between objects G-Code (for sequential printing)
Color change G-Code
Pause Print G-Code
Template custom G-Code

Filament G-Codes
Start G-Code
End G-Code

Edited 1 time(s). Last edit at 12/22/2020 07:54PM by Roberts_Clif.

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Computer Programmer / Electronics Technician

RepRapFirmware runs file start.g on the SD card at the start of every print.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].